1999 Dodge Durango 5.9 w/ rear air

I pulled this truck out of the junk yard about a year ago. The heater core and a/c evaporator were both bad. I replaced both of them. I then proceeded to purchase a new compressor, drier, and expansions valves online from an amazon seller. I had a shop charge the system and it would never get cold, It would only go about 10 degrees below the temp outside if i was lucky. The shop said they could not verify the parts were good so they bought a whole new system and installed it . The truck still would not blow cold air. I then researched and found my model did not have an electric fan to aid the mechanical fan so I decided to add one. https://dodgeforum.com/forum/1st-gen...-fan-pics.html l (if you want to see the install) The efan keeps the truck cool, and sucks a ton of air though the condenser. I also tried to run cold water over the condenser and it did not help. After all my attempts it still is not working . So today I had the shop tell me the pressures that they were seeing on the system. Low side 55psi, high side 200psi it was 70 degrees out. If anyone has suggestions I am open to them. Also what is this..




Because this is like the only part i did not replace on the system.

Majerus

 

If your getting 55 PSI on the low side at 70F then your system is WAY overcharged.... the FSM calls for 20-30 PSI at 70F...




If the shop charged it to this and do not know that its well overcharged then i would look for another shop!

 

I will have to do that then. Should I disconnect the ac until I can get it evacuated and recharged to prohibit damage? Also I seldom drive the truck so since this has been installed I would say there has been only about 150mi driven.

 

Is that baffle looking thing important?

 

Not 100% sure what it is but, you ca buy the whole hose assembly from rock auto for under $60. If it where me and the $$ is there i would just replace it while the system is empty if anything for piece of mind..

 

If memory serves, that bulge that looks like a bottle should be the accumulator. It prevents liquid from going back to the compressor causing hydraulic pressure and blow the valves.

I would have to agree that your system is overcharged given the high side and low side are way too high in relation to the outdoor ambient temperature. You can just bleed out the pressure slowly.

Once you resolve this, you may want to wrap up your A/C return line (one with the big bottle as part of the hose back to the compressor). It will help in keeping the temperatures cold in your cabin.

 

Ill have to try the wrapping thing. I was about to figure out a way to bypass the heater core with ball shutoff valve..

 

Funny you should mention that.... i have done that to mine....